One Theory About the Relationship Between Global Warming and the Shift

One theory about the relationship between global warming and the shift from foraging to food production holds that

A) the warming that followed the last ice age left wide swaths of highly fertile land
B) the warming that took place after the last ice age made the environment more habitable
C) the time after the last ice age allowed new types of plants to flourish and become cultigens
D) the gradual warming after the last ice age allowed humans to domesticate animals easily